Cooled blow mold for industrial furnaces particularly blast furnaces

ABSTRACT

A cooled blow mold for industrial furnaces, particularly blast furnaces, wherein the feeding of the cooling agent is led in between an outer and an inner blow mold jacket which enclose the cooling chamber directly to the blow head. A ring chamber is located at the blow head and the cooling agent is led from there through the cooling chamber to the outflow of the cooling agent connected to the blow mold foot. A concentrical displacement body is set in the cooling chamber which receives the feeding line. The displacement body divides the cooling chamber into an outer, an inner and through a radial ring wall into an annular chamber of the blow head. Overflow openings are provided for the cooling agent in the ring wall in the cross-sectional area of the outer and the inner annular chamber, through which the cooling agent is led along both annular chambers to the outflow of the cooling agent.

References Cited UNITED STATES PATENTS 5/]882 Gordon...........

5/1960 Kesterton....

Primary Examiner-Gerald A. Dost Attorney-Wenderoth, Lind and PonackABSTRACT: A cooled blow mold for industrial furnaces, particularly blastfurnaces, wherein the feeding of thecoolin through a radial ring wallinto an annular chamber of the blow head. Overflow openings are providedfor the cooling agent in the ring wall in the cross-sectional area ofthe outer and the inner annular chamber, through which the cooling agentis led along both annular chambers to the outflow of the cooling agent.

Inventors Johannes Uerliclhs WoIfelsbnch/Ell'el; Rudolf Muller,Merzeniclh; Wilhelm Kuckertz, Konzendorf, all 01 Germany 18,066 Mar. 10,1970 Patented Dec. 14, I971 [73] Assignee Hermann Rappold 8: Co.

Duren-Mrkesdorl, Germany Priority Mar. 10, 1970 Germany P 19 11 938.1

COOLED BLOW MOLD FOR INDUSTRIAL FURNACES PARTICULARLY BLAST FURNACES 9Claims, 5 Drawing Figs.

lint. Field of United States I [21] AppLNo [22] Filed PATENTEU DEC 1 4I971 INVENTORS JOHANNESHUERLICHS RUDOLF MULLER WI LHELM KUCKERTZ ATTORNEY5 PATENTEB naml n 3.627.296 sum 3 or a mvlzmons JOHANNES" UERLICHSRuoou MULLER WILHELM KUCKERTZ BY z/wwiw wz ATTORNEYS COOJUEJD BLOW MOLDlFOllt INDUSTRIAL FURNAGIES PARTICULARLY BLAST FURNACES This inventionrelates to a cooled blow mold for industrial furnaces, particularlyblast furnaces, such as are built into the furnace wall and are used forblowing hot air into the furnace chamber.

These blow molds are subjected generally to the greatest thermal andmechanical wear at the free and unprotected socalled blow head whichprojects into the furnace, and which constitutes the front part of theform. It is therefore important to construct the blow mold in such away, that the blow head can be optimally cooled. The known blow moldsfulfill only insufficiently this requirement. 7

It is known in the case of a blast tuyere for shaft furnaces, that thecooling agent is led through a helical twin tube spiral which is twistedaround the internal conical blow mold jacket (inner tube) from theinflow of the blow mold foot first through the outer spiral to the blowhead and subsequently over the internal spiral back to the outflowlocated in the blow mold foot. Besides the fact that such blow molds arevery expensive and quite unstable, their cooling action remainsunsatisfactory, since the cooling agent in the outer spiral on its wayto the blow head through absorption of heat from the furnace walls isalready heated to such a point that it is not able to absorb enough heatfrom the blow head and to carry it off.

This disadvantage has been realized, and an attempt has been made toovercome it in a further known cooled blow mold by feeding the coolingagent between an outer and an inner conical blow mold jacket whichencloses the cooling chamber through a flow-in pipe directly to the blowhead, particularly to an annular chamber which is located there, so thatthe cooling agent can arrive practically in its cold condition directlyto the hottest zone of the blow mold. From there it is taken along theouter jacket again in helical pipes jointed to each other to the blowmold foot and again is taken in a pipe near to the blow head, and fromthere it goes again to the blow mold foot and the flowout by passingthrough the cooling chamber formed by the internal blow mold jacket andthe internaljacket of the tube spiral of the exterior jacket. A greatlyincreased sectional area prevents a higher rotational speed of thecooling agent in the blow head and thus reduces the cooling effect. Byreturning again the hot water coming out of the blow head zone into thearea of the blow head produces a decrease of the rotational speed andthe cooling effect speed and the cooling effect in the interiorjacket ofthe blow mold.

An object of the invention, based on the latter category of blow molds,is to remove the above disadvantages by feeding the cooling agentdirectly to the blow head, in order to bring as rapidly as possible anentirely cold cooling agent to the area of the blow mold which is underthe highest thermal stress and most endangered, and it is its aim,besides eliminating the already mentioned disadvantages to allow bymeans of a relatively simple, inexpensive construction of a blow mold toobtain an optimal velocity of flow of the cooling agent in the blow headwith sufficiently good retroactive cooling of the inner and outer jacketof the blow mold as well as allowing by changing the flow sections toobtain and adaptation of the cooling performance to the different plantcondition with re gard to furnace temperature, pressure and consumptionof the cooling agent, etc.

For this object in a cooled blow mold of the above mentioned typeaccording to this invention there is a displacement body setconcentrically in the cooling chamber which preferably picks up the feedpipe, and which divides the cooling chamber into an outer, and inner andthrough a radial ring wall into an annular chamber of the blow head, andfurther in the ring wall in the cross-sectional area of the outer andinner annular chamber there are overflow openings for the cooling agentthrough which the cooling agent is led along both annular chambers tothe cooling agent outlet.

It is advantageous when there is an overflow opening in the annularchamber of the blow head which is separated directly through a partitionnext to the mouth of the feeding line and one along the turned away sideof the mouth of the feeding line in the cross-sectional area of theouter and inner annular chamber.

Through the displacement body which can also be formed like a flowthrough hollow body it has been possible in the traditional blow moldsto subdivide in a very suitable way the classical cooling chamber formedby an outer and an inner jacket into an outer cooling chamber related tothe outer jacket, into an inner jacket related to the inner coolingchamber and into a cooling chamber which is directed with its frontalsurface to the blow head, that is to say into three annular chambers,whereby their sections can be easily determined by adequately measuringthis displacement body.

According to another aspect of the invention, the feeding line for thecooling agent which leads directly to the blow head can be used as adisplacement body coaxially set inside the cooling chamber, wherebyitsend which projects into the blow head has an outlet nozzle with atorus directed to the frontal area of the blow head. Since through thetorus there is an increase in size of the diameter of the displacementbody in this area, which determines the flow speed of the cooling agentin the blow head, the smaller outer diameter of the displacement bodynext to the torus prevents losses of pressure when the cooling agentflows back along the outer and inner cooling chamber.

The flow and pressure conditions in the blow head in an advantageousfurther development of the invention can be changed in such a way thatthe displacement body in order to change the size of the flow-throughcross section in the area of the annular chamber of the blow head can beaxially displaced and locked into position. For this purpose there canbe provided several regulating units in the tuyere bottom of the torusof the displacement body, preferably adjusting screws which grip throughthe tuyere bottom and brace themselves against the inner surface of theannular chamber of the blow head, and the connection of the feed pipeset in the foot of the blow mold together with the displacement body canbe done through an axially movable closed linkage.

In order to always assure a coaxial position of the displacement bodyinside the inner and outer jackets of the blow mold, particularly duringits axial adjustment, range spacers can be set on the inner jacket ofthe displacement body. In order to obtain the best flow conditions inthe inner and outer annular chambers which receive the flowing backcooling agent as well as a good heat exchange on the inner andouterjacket (avoiding for instance boundary layers, turbulences, etc.)the outer and inner annular chambers of the cooling chamber can have afin radially directed, and running helical to the foot of the blow mold.Additionally the fins in the area of the blow head can run first at adistance in single spiral turns, and then can go over to helical pitch.This has the advantage that the cold cooling agent directly led from theoutside into the blow head flows in a circular pattern several timesthrough the ringshaped cooling chamber before it returns to the foot ofthe blow mold to be let out via the inner and outer annular chambeta ofthe cooling chamber.

With the above and other objects in view which will become apparent fromthe detailed description below some preferred embodiments of theinvention are shown in the drawings, in which:

FIG. It shows a blow mold in a longitudinal section,

FIG. 2 shows the blow head of FIG. l in a partial section along the linelI--ll in FIG. I,

FIG. 3 shows a partial section through the blow head along the lineIII-Ill in FIG. 2,

FIG. 4 shows a modification in a blow mold in a longitudinal section,and

FIG. 5 shows a plan view in the direction of the blow mold foot of theblow mold according to FIG. 4.

On the blow mold foot I of a blast furnace blow mold according to FIG. Ithere is welded as an inner jacket a pipe 2 and an outer jacket aconical pipe 3 which is tapered in the direction of the blow head andwhich in a cross section is ring shaped. Both pipes are connected ontheir free ends by a ring shell 5 welded at d, which fonns the blowhead.

A further pipe 6, which has a larger diameter than pipe 2, and anequally long pipe 7 conically tapered in the direction of the blow headwhich in its cross section is equally circular shaped and which is of asmaller diameter than the diameter of side the cooling chamber formed bythe inner and outer jacket 2 and 3 an annular chamber 10 is formed atthe same time inside the blow head. Through a feeding pipe 11 which runsthrough the blow mold foot and the displacement body the cold watercooling agent is forced directly into annular chamber 10 of the blowhead.

In order that it can circulate in a determined direction and so that thecross section surface of the pipe at the mouth of the pipe cannot bechanged, the pipe mouth is slightly bent (FIG. 2) and has an approximateteardrop-shaped cross section (FIG. 3). Annular chamber 10 is separatedby a dividing wall 13 set directly next to the pipe mouth 12 (FIGS. 2and 3), so that the inflowing cooling agent can almost make a rotationinside the annular chamber, in order to reach the cooling chambers l4and 15 respectively through either one of the slit openings 16 and 17set in the ring wall 9 in the area of the cross-sectional surfaces ofthe inner cooling chamber 14 and the outer cooling chamber 15.

Both cooling chambers 14 and 15 are provided with a fin shown at l6 andI7 dotted, welded on the ring wall 9. The fins 18 and 19 cross helicallytwisted the cooling chambers 14 and 15 at the distance of theirgenerated surfaces 2, 3 to the jacket of the displacement body 6, 7. Atthe beginning 16 and 17 respectively they start in the area of the blowhead with approximately three windings parallel to each other which thengo over to windings which have an increased pitch. The fins are alwayswelded onto the inner jacket 6 and to the outer jacket 7 respectively ofthe displacement body. The cross section in the annular chamber 10detennines the desired rotational speed of the cooling agent and can bekept in such a way that the cooling agent reaches a rotational speed ofapproximately 7m./sec. which decreases only slightly in the parallelconduits of the blow head, in order to decrease gradually in the helicalconduits which have a relatively higher pitch going towards the blowmold foot in order to flow out through an outflow pipe 21 which isfastened in the blow mold foot and is connected with the coolingchambers 14 and 15 which come together in annular chamber 20.

The displacement body for economical construction reasons may be cast.Three adjusting screws 22 or similar means set at an equal distance fromeach other at the periphery of the blow mold foot and penetrating ithold tight over wall 8 the displacement body in the cooling room of theblow mold and allow, when releasing against the pressure existing in theannular chamber 10, an axial displacement of the displacement body andthus a size increase of the cross section of the annular chamber 10 ascompared to the shown minimum size.

FIGS. 4 and 5 show a blow mold, wherein the feed pipe is at the sametime a displacement body. In the cooling chamber formed by an inner andan outer pipe jacket 23 and 24 respectively which run conically to theblow mold and which in a cross section are circular shaped, and theirfrontal surfaces are shut off jointly through the blow mold foot 25 andan annular shell 26 of the blow head. The cooling chamber is essentiallycoaxially adjusted to an analogously constructed displacement body 27,which is formed of an outer pipe 28 and an inner pipe 29 which are ringshaped in cross section and the opposite lying frontal surfaces whichare closed in by ring walls 30 and 31 respectively and which areconnected to the feed pipe 32 for feeding the cooling agent which passesthrough the blow mold foot. The ring wall 31 is shaped as a torus andhas on its side turned towards the frontal face of the blow head severalnozzle like holes 33, through which the cooling agent is forced into anannular chamber 34 formed in between ring wall 31 and ring shell 26which has a smaller cross section surface, from where the cooling agentflows along the annular chambers 35 and 36 formed in between thedisplacement body and the inner and outer jackets in the direction ofthe blow mold foot to the flow out pipe 37. The inside diameter of thedisplacement body is here somewhat larger than the smallest insidediameter of the torus and the external diameter of the displacement bodyis somewhat smaller than the largest diameter of the toms, wherebypressure losses of the cooling agent which flows with a 7m./sec.velocity of flow into the annular chamber 34 are reduced. For regulatingthe desired velocity of the cooling agent in the area of the annularchamber of the blow head 34 and for influencing the correspondingpressure loss, the displacement body possesses two adjusting screws 38set in the ring wall 31, or similar means which by activating a socketwrench which is led through the feed pipe 32 and outflow pipe 37 as wellas the stufi'lng-box stud 39 allows an axial movement of thedisplacement body, when at the same time the screw threading 40 at theconnecting place of the feed pipe-displacement body is adjusted. Alongthe inner jacket surface 29 distributed over the periphery there areseveral spacing pieces 41 shaped as sheet metal strips welded onto thedisplacement body, in order to avoid the canting of the displacementbody.

We claim:

I. Cooled blow mold having a blow head for industrial furnaces,particularly blast furnaces, comprising an outer and an inner blow moldjacket between which a cooling agent is fed, said jackets enclosing acooling chamber directly to the blow head, a ring chamber in saidcooling chamber whereby the cooling agent may be led from said ringchamber through said cooling chamber to the outflow of the cooling agentcon nected to the blow mold foot, a concentrical displacement bodyhaving a radial ring wall in said cooling chamber receiving said coolingagent, said displacement body dividing said cooling chamber into anouter, an inner and by said radial ring wall into an annular chamber insaid blow head, said ring wall having overflow openings for the coolingagent in the crosssectional area of said outer and inner annularchambers through which the cooling agent is led along both annularchambers to the outflow of the cooling agent.

2. Blow mold according to claim 1, wherein the annular chamber of saidblow head is divided by a partition directly next to the feeding mouth,and wherein along the side turned away from the feeding mouth of saidpartition in the cross-sectional area of the outer and inner annularchambers there is respectively an overflow opening in the ring wall.

3. Blow mold according to claim 1, wherein said displacement body isbuilt as a flow through hollow body.

4. Blow mold for industrial furnaces, according to claim 1, wherein afeed line for a cooling agent going directly to the blow head is builtas a displacement body which is coaxially set inside said coolingchamber, the end of said feed line projecting into said blow head, saidend having a torus with an outlet nozzle directed to the frontal surfaceof the blow head.

5. Blow mold according to claim 4, wherein said displacement body isaxially movable and fixable in order to change the size of theflow-through cross section in the area of the annular chamber of theblow head.

6. Blow mold according to claim 5 wherein a plurality of regulatingunits are provided on the tuyere bottom and brace against the innerfrontal surface of the annular chamber of the blow head, as well asthrough an axially tensional movable connection of the feed pipe locatedin the foot of the blow mold with the displacement body.

7. Blow mold according to claim 6, wherein there is a spacer located inthe inner jacket of the displacement body.

8. Blow mold according to claim 1 wherein said outer and inner annularchamber of the cooling chamber is provided each with a fin radiallydirected, running helically to the blow mold foot.

9. Blow mold according to claim whereby the fins adjacent said blow headrun at the beginning at a distance in singular spiral windings whichlater change into a helical pitch.

t 13K l l UNITED STATES PATENT AND TRADEMARK OFFICE CERTIFICATE OFCORRECTION PATENT NO. 3, 627,296

DATED I December 14, 1971 NVENTOR(5 1 JOHANNES UERLICHS ET AL.

It is certifi ed that error appears in the above-identified patent andthat said Letters Patent are hereby corrected as shown below:

In the priority data on the first page, change "March 10, 1970" to March10, 1969 Signed and Scaled this Eighth Day of March 1977 [SEAL] Arrest:

RUTH C. MASON C. MARSHALL DANN Arresting Officer Commissioner oj'Parenrsand Trademarks r

1. Cooled blow mold having a blow head for industrial furnaces,particularly blast furnaces, comprising an outer and an inner blow moldjacket between which a Cooling agent is fed, said jackets enclosing acooling chamber directly to the blow head, a ring chamber in saidcooling chamber whereby the cooling agent may be led from said ringchamber through said cooling chamber to the outflow of the cooling agentconnected to the blow mold foot, a concentrical displacement body havinga radial ring wall in said cooling chamber receiving said cooling agent,said displacement body dividing said cooling chamber into an outer, aninner and by said radial ring wall into an annular chamber in said blowhead, said ring wall having overflow openings for the cooling agent inthe cross-sectional area of said outer and inner annular chambersthrough which the cooling agent is led along both annular chambers tothe outflow of the cooling agent.
 2. Blow mold according to claim 1,wherein the annular chamber of said blow head is divided by a partitiondirectly next to the feeding mouth, and wherein along the side turnedaway from the feeding mouth of said partition in the cross-sectionalarea of the outer and inner annular chambers there is respectively anoverflow opening in the ring wall.
 3. Blow mold according to claim 1,wherein said displacement body is built as a flow through hollow body.4. Blow mold for industrial furnaces, according to claim 1, wherein afeed line for a cooling agent going directly to the blow head is builtas a displacement body which is coaxially set inside said coolingchamber, the end of said feed line projecting into said blow head, saidend having a torus with an outlet nozzle directed to the frontal surfaceof the blow head.
 5. Blow mold according to claim 4, wherein saiddisplacement body is axially movable and fixable in order to change thesize of the flow-through cross section in the area of the annularchamber of the blow head.
 6. Blow mold according to claim 5 wherein aplurality of regulating units are provided on the tuyere bottom andbrace against the inner frontal surface of the annular chamber of theblow head, as well as through an axially tensional movable connection ofthe feed pipe located in the foot of the blow mold with the displacementbody.
 7. Blow mold according to claim 6, wherein there is a spacerlocated in the inner jacket of the displacement body.
 8. Blow moldaccording to claim 1 wherein said outer and inner annular chamber of thecooling chamber is provided each with a fin radially directed, runninghelically to the blow mold foot.
 9. Blow mold according to claim 8,whereby the fins adjacent said blow head run at the beginning at adistance in singular spiral windings which later change into a helicalpitch.